If you thought lichen only lives on rocks, guess again. Here’s a patch growing on a gnarly old cottonwood tree near the base of Dillon Dam. Check out the rest of this Instagram set. The square-format images show well in the blog column, and you can also visit our online gallery at Fine Art America to view and buy high quality prints and greeting cards.

Pat yourselves on the back, Coloradans.A WalletHub survey show that residents of the state's three largest cities — Denver, Aurora and Colorado Springs — are harder workers than most of their peers nationally.